Start by preheating your oven to 375°F (190°C). Prepare a 12-cup muffin tin by lightly greasing it or lining with muffin liners.
Take a large bowl and combine the flour, baking soda, baking powder, and salt.
In a separate bowl, mix the mashed bananas with sugar, the lightly beaten egg, and melted butter until well combined.
Gently fold the banana mixture into the dry ingredients, being careful not to overmix. Just stir until the mixture is just moistened.
Carefully fold in the chocolate chips into the batter.
Evenly distribute the batter among the prepared muffin cups, filling each about three-quarters full.
Bake in the preheated oven for about 18 to 20 minutes. Check for doneness by inserting a toothpick into the center of a muffin; it should come out clean.
Allow the muffins to cool in the pan for a few minutes before transferring them to a wire rack to cool completely. Enjoy your delicious banana chocolate chip muffins